<template>
	<view>
		<!-- 自定义搜索组件 -->
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
				<block :key="i" v-for="(item,i) in cateList">
					<view :class="['left-scroll-view-item',i===active ? 'active' : '']" @click="activeChange(i)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<!-- 二级分类标题 -->
				<view class="cate-lv2" :key="i2" v-for="(item2,i2) in cateLevel2">
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<!-- 三级分类 -->
					<view class="cate-lv3-list">
					
						<view class="cate-lv3-item" :key="i3" v-for="(item3, i3) in item2.children" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		data() {
			return {
				// 当前设备可用高度
				wh:0,
				// 分类数据列表
				cateList:[],
				// 默认激活项
				active:0,
				// 二级分类列表
				cateLevel2:[],
				// 滚动条距离顶部的距离
				scrollTop:0
			};
		},
		onLoad(){
			// 获取当前设备信息
			const sysInfo=uni.getSystemInfoSync()
			console.log(sysInfo)
			// windowHeight为屏幕可用高度,50为搜索框高度
			this.wh=sysInfo.windowHeight-50
			// 调用分类数据
			this.getCateList()
		},
		methods:{
			async getCateList(){
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				// console.log(res)
				if(res.meta.status !==200) return uni.$showMsg()
				// 存储一级分类数据
				this.cateList=res.message
				// 存储二级分类数据
				this.cateLevel2=res.message[0].children
				// 存储三级分类数据
			},
			// 左侧标签栏
			activeChange(i){
				// 设置当前点击项的值
				this.active=i;
				// 重新为二级分类索引赋值
				this.cateLevel2=this.cateList[i].children
				// 重置滚动条距顶部距离
				this.scrollTop=this.scrollTop === 0 ? 1:0
			},
			// 右侧小图片跳转
			gotoGoodsList(item3) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
			  })
			},
			// 搜索框点击事件
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		},
		// 购物车数字徽标
		mixins:[badgeMix]
	}
</script>

<style lang="scss">
	.scroll-view-container{
		display: flex;
		
		.left-scroll-view{
			width: 120px;
		}
		.left-scroll-view-item{
			background-color: #f7f7f7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active{
				background-color: #fff;
				position: relative;
				&::before{
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
		.cate-lv2-title{
			font-size: 12px;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
		}
		.cate-lv3-list{
			display: flex;
			flex-wrap: wrap;
			margin-bottom: 10px;
			.cate-lv3-item{
				width: 33.33%;
				display: flex;
				flex-direction: column;
				justify-content: center;
				align-items: center;
				image{
					width: 60px;
					height: 60px;
				}
				text{
					font-size: 12px;
				}
			}
		}
	}
</style>
